Pneumatic tire.



Nu. 670,866. Patented Mar. 26, |90l.

P. W. TILLINGHAST. PNEUMATIC TIRE.

(Application led Apr. 24, 1897.) (No Model.)

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PARDON W. TILLINGHAST, OF EDGEWOOD, RHODE ISLAND.

PNEUMATIC TIRE.

SPECIFICATION forming part of Letters Patent No. 670,866, dated March26, 1901.

Application led April 24, 1897.

To all whom, it may concern:

Be it known that I, PARDON WILBUR TIL- LINGHAST, a citizen of the UnitedStates, residing at Edgewood, in the town of Cranston, county ofProvidence, and State of Rhode Island, have invented a new and usefulImprovement in Pneumatic Tires, of which the following is aspecification.

My invention relates to that class of tires which are commonly calleddouble tube, that can be quickly detached from the rim and held in placeon the rim without the use of cement. In this class of tires it iscustomary to employ a sheath or strengthening-jacket for the air-tube.This sheath is divided along its inner circumference, and the edges ofthe sheath are provided with beads that coperate with the rim to holdthe sheath in engagement. In all tires of this class they are detachedby exerting an inward and sidewise pressure and a sudden side slip orstrain, as in turning a corner, is liable to roll the tire from the rim.These side strains are on one side at a time only, and a pressure on oneside tending to disengage that edge of the tire-sheath exerts an equalpressure on the opposite edge to hold it in place. I take advantage ofthis fact and make the sheath edges dependent on each other, so thatboth sides of the sheath must be simultaneously pressed inward beforeeither side can be detached, thus making it impossible to accidentallydisplace the tire.

Figure l is a transverse section of the tire, showing its appearancewhen iniiated. Fig. 2 illustrates the position of the sheath under aside strain. Fig. 3 shows the position the sheath must be in beforeeither bead can be removed from the rim. Fig. -l is the same tirewithout the interlocking feature.

Similar letters refer to similar parts throughout the several views.

Referring to the drawings, d is the tiresheath, forming therestraining-jacket for the air-tu be c. The beaded edges b b ofthesheath a are designed to rest in the groove e of the rim d. The bandfencircles the rim and properly forms a part of the same, although it isnot rigidlyattached. The beads b b enter the groove of the rim a in acircular direction on either side of the band f, under which they hook.This band takes the strain of iniiation, and the outside of the beadsare steadied on Serial No. 633,798. lNo model.)

the edge of the rim in a line with the fulcrum edges ot' the band. Theinner edges of the beads b b have cog-like projections that meshtogether as the beads approach each other on entering the grooves of therim in their curved pathways, and when the tire is inflated the outwardmovement of the side walls carry the inner ends of the beads upward bymeans of their pivotal action with the edges of the band f, thussecurely locking them against accidental displacement.

It is obvious that it will be necessary to carry both side walls of thetire inward before either bead can be removed from the rim. This isillustrated in Figs. 2 and 3, the former showing the result of apressure on one side only, while the latter illustrates a pressure onboth sides. As shown in Fig. 4E, a tire can be made and be operativewith one rim-groove, a substantiallyunattached band, and two beadswithout the interlocking feature; but I prefer to utilize theself-locking feature of the interlocking beads, as with it it isimpossible to accidentally detach the tire-sheath.

I claim as my invention y l. In com bination, a wheel-rim with asinglegroove, a hoop of less width than the groove of the rim, having a fixeddiameter greater than the rim at the bottom of the groove, and atire-sheath having beaded edges; the edges of the hoop serving as pivotsaround which the beaded edges of the sheath turn in and out of thegroove of the rim.

2. In combination, a tire sheath having beaded edges, a wheel-rim withasingle groove, a hoop having a fixed diameter around the edges of whichhoop the beaded edges of the tire-sheath turn in and out of the grooveof the rim7 and means, substantially as described, to prevent anaccidental disengaging movement of the beaded sheath edges.

3. In combination, a tire-sheath having attaching-beads, a groovedwheel-rim, a metallic hoop ont of contact with the rim, the edges ofsaid hoop serving as pivots around which the beads turn in and out ofthe groove, and means to lock the beads to prevent an independentoutward turning movement, substantially as described.

4. In combination, a tire-sheath having attaching-beads, a groovedwheel-rim, a metallic hoop out of contact with the rim, the edges IOO acircular direction :iny and out of the groove of the rim.

6. A rim of a Wheel having a single groove',- and a divided tire-sheathprovided with attaching-'beads that engage pivotally with the edges of ametallic band which encircies the rim out of contact therewith andserves t0 conne the beads to the groove When the tire is inflated,substantially as described.

PARDON W. TlLLlNGHAST.

Witnesses:

ALvA L. BURDICK, S. K. DALGLIESH.

